塔河常压渣油中不同沥青质的组成与结构研究

COMPOSITIONS AND STRUCTURES OF DIFFERENT ASPHALTENES IN TAHE ATMOSPHERIC RESIDUE

以塔河常压渣油为原料,分别以正戊烷、正己烷和正庚烷为溶剂,分离制得3个沥青质试样C_5-As,C_6-As,C_7-As,采用SEM,XRD,FT-IR,TG-DTG等方法,分析表征了其表面形态、晶体结构、官能团结构和热解性能等。结果表明:随着溶剂碳链的增加,C_5-As,C_6-As,C_7-As试样的收率逐渐减小,其值分别为33.57%,26.98%,21.12%;表面逐渐粗糙,粒径递减;芳香片层数和芳构化程度增加;芳环取代度降低,缩合度增大;热稳定性增强,残炭增加。

The samples of C 5 -As,C 6 -As and C 7 -As asphaltene were separated from the Tahe atmospheric residue （THAR） by n -pentane, n -hexane and n -heptane solvent,respectively. The surface morphology,crystal structure,functional groups and pyrolysis performance of samples were characterized by SEM,XRD,FT-IR and TG-DTG techniques. The results showed that with increase of solvent carbon chain length,the yield of C 5 -As,C 6 -As and C 7 -As becomes 33.57%,26.98% and 21.12%,respectively; the surface of three samples were gradually more rough,the particle size decreases; the layer number of aromatic ring and aromatization degree in the molecular structure cell are increased; aromatic ring substitution decreases and condensation extent increases; the thermal stability and the residual carbon of the samples are increased.